MILAN, ITALY - NOVEMBER 09: Gianluigi Quinzi of Italy serves the ball in his match against Hyeon Chung of South Korea during Day 3 of the Next Gen ATP Finals on November 9, 2017 in Milan, Italy. (Photo by Emilio Andreoli/Getty Images)
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MILAN, ITALY - NOVEMBER 09: Gianluigi Quinzi of Italy returns a backhand in his match against Hyeon Chung of South Korea during Day 3 of the Next Gen ATP Finals on November 9, 2017 in Milan, Italy. (Photo by Emilio Andreoli/Getty Images)
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MILAN, ITALY - NOVEMBER 09: Hyeon Chung of South Korea returns a forehand in his match against Gianluigi Quinzi of Italy during Day 3 of the Next Gen ATP Finals on November 9, 2017 in Milan, Italy. (Photo by Emilio Andreoli/Getty Images)
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MILAN, ITALY - NOVEMBER 09: Hyeon Chung of South Korea looks on in his match against Gianluigi Quinzi of Italy during Day 3 of the Next Gen ATP Finals on November 9, 2017 in Milan, Italy. (Photo by Emilio Andreoli/Getty Images)
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MILAN, ITALY - NOVEMBER 09: Hyeon Chung of South Korea reacts in his match against Gianluigi Quinzi of Italy during Day 3 of the Next Gen ATP Finals on November 9, 2017 in Milan, Italy. (Photo by Emilio Andreoli/Getty Images)
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